Archipelago » qemu

static void glue(bswap_ehdr, SZ)(struct elfhdr *ehdr)

{

    bswap16s(&ehdr->e_type);                        /* Object file type */

    bswap16s(&ehdr->e_machine);                /* Architecture */

    bswap32s(&ehdr->e_version);                /* Object file version */

    bswapSZs(&ehdr->e_entry);                /* Entry point virtual address */

    bswapSZs(&ehdr->e_phoff);                /* Program header table file offset */

    bswapSZs(&ehdr->e_shoff);                /* Section header table file offset */

    bswap32s(&ehdr->e_flags);                /* Processor-specific flags */

    bswap16s(&ehdr->e_ehsize);                /* ELF header size in bytes */

    bswap16s(&ehdr->e_phentsize);                /* Program header table entry size */

    bswap16s(&ehdr->e_phnum);                /* Program header table entry count */

    bswap16s(&ehdr->e_shentsize);                /* Section header table entry size */

    bswap16s(&ehdr->e_shnum);                /* Section header table entry count */

    bswap16s(&ehdr->e_shstrndx);                /* Section header string table index */

}

static void glue(bswap_phdr, SZ)(struct elf_phdr *phdr)

{

    bswap32s(&phdr->p_type);                        /* Segment type */

    bswapSZs(&phdr->p_offset);                /* Segment file offset */

    bswapSZs(&phdr->p_vaddr);                /* Segment virtual address */

    bswapSZs(&phdr->p_paddr);                /* Segment physical address */

    bswapSZs(&phdr->p_filesz);                /* Segment size in file */

    bswapSZs(&phdr->p_memsz);                /* Segment size in memory */

    bswap32s(&phdr->p_flags);                /* Segment flags */

    bswapSZs(&phdr->p_align);                /* Segment alignment */

}

static void glue(bswap_shdr, SZ)(struct elf_shdr *shdr)

{

    bswap32s(&shdr->sh_name);

    bswap32s(&shdr->sh_type);

    bswapSZs(&shdr->sh_flags);

    bswapSZs(&shdr->sh_addr);

    bswapSZs(&shdr->sh_offset);

    bswapSZs(&shdr->sh_size);

    bswap32s(&shdr->sh_link);

    bswap32s(&shdr->sh_info);

    bswapSZs(&shdr->sh_addralign);

    bswapSZs(&shdr->sh_entsize);

}

static void glue(bswap_sym, SZ)(struct elf_sym *sym)

{

    bswap32s(&sym->st_name);

    bswapSZs(&sym->st_value);

    bswapSZs(&sym->st_size);

    bswap16s(&sym->st_shndx);

}

static struct elf_shdr *glue(find_section, SZ)(struct elf_shdr *shdr_table,

                                               int n, int type)

{

    int i;

    for(i=0;i<n;i++) {

        if (shdr_table[i].sh_type == type)

            return shdr_table + i;

    }

    return NULL;

}

static int glue(symfind, SZ)(const void *s0, const void *s1)

{

    struct elf_sym *key = (struct elf_sym *)s0;

    struct elf_sym *sym = (struct elf_sym *)s1;

    int result = 0;

    if (key->st_value < sym->st_value) {

        result = -1;

    } else if (key->st_value >= sym->st_value + sym->st_size) {

        result = 1;

    }

    return result;

}

static const char *glue(lookup_symbol, SZ)(struct syminfo *s,

                                           target_phys_addr_t orig_addr)

{

    struct elf_sym *syms = glue(s->disas_symtab.elf, SZ);

    struct elf_sym key;

    struct elf_sym *sym;

    key.st_value = orig_addr;

    sym = bsearch(&key, syms, s->disas_num_syms, sizeof(*syms), glue(symfind, SZ));

    if (sym != NULL) {

        return s->disas_strtab + sym->st_name;

    }

    return "";

}

static int glue(symcmp, SZ)(const void *s0, const void *s1)

{

    struct elf_sym *sym0 = (struct elf_sym *)s0;

    struct elf_sym *sym1 = (struct elf_sym *)s1;

    return (sym0->st_value < sym1->st_value)

        ? -1

        : ((sym0->st_value > sym1->st_value) ? 1 : 0);

}

static int glue(load_symbols, SZ)(struct elfhdr *ehdr, int fd, int must_swab,

                                  int clear_lsb)

{

    struct elf_shdr *symtab, *strtab, *shdr_table = NULL;

    struct elf_sym *syms = NULL;

    struct syminfo *s;

    int nsyms, i;

    char *str = NULL;

    shdr_table = load_at(fd, ehdr->e_shoff,

                         sizeof(struct elf_shdr) * ehdr->e_shnum);

    if (!shdr_table)

        return -1;

    if (must_swab) {

        for (i = 0; i < ehdr->e_shnum; i++) {

            glue(bswap_shdr, SZ)(shdr_table + i);

        }

    }

    symtab = glue(find_section, SZ)(shdr_table, ehdr->e_shnum, SHT_SYMTAB);

    if (!symtab)

        goto fail;

    syms = load_at(fd, symtab->sh_offset, symtab->sh_size);

    if (!syms)

        goto fail;

    nsyms = symtab->sh_size / sizeof(struct elf_sym);

    i = 0;

    while (i < nsyms) {

        if (must_swab)

            glue(bswap_sym, SZ)(&syms[i]);

        /* We are only interested in function symbols.

           Throw everything else away.  */

        if (syms[i].st_shndx == SHN_UNDEF ||

                syms[i].st_shndx >= SHN_LORESERVE ||

                ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {

            nsyms--;

            if (i < nsyms) {

                syms[i] = syms[nsyms];

            }

            continue;

        }

        if (clear_lsb) {

            /* The bottom address bit marks a Thumb or MIPS16 symbol.  */

            syms[i].st_value &= ~(glue(glue(Elf, SZ), _Addr))1;

        }

        i++;

    }

    if (nsyms) {

        syms = qemu_realloc(syms, nsyms * sizeof(*syms));

        qsort(syms, nsyms, sizeof(*syms), glue(symcmp, SZ));

    } else {

        qemu_free(syms);

        syms = NULL;

    }

    /* String table */

    if (symtab->sh_link >= ehdr->e_shnum)

        goto fail;

    strtab = &shdr_table[symtab->sh_link];

    str = load_at(fd, strtab->sh_offset, strtab->sh_size);

    if (!str)

        goto fail;

    /* Commit */

    s = qemu_mallocz(sizeof(*s));

    s->lookup_symbol = glue(lookup_symbol, SZ);

    glue(s->disas_symtab.elf, SZ) = syms;

    s->disas_num_syms = nsyms;

    s->disas_strtab = str;

    s->next = syminfos;

    syminfos = s;

    qemu_free(shdr_table);

    return 0;

 fail:

    qemu_free(syms);

    qemu_free(str);

    qemu_free(shdr_table);

    return -1;

}

static int glue(load_elf, SZ)(const char *name, int fd,

                              uint64_t (*translate_fn)(void *, uint64_t),

                              void *translate_opaque,

                              int must_swab, uint64_t *pentry,

                              uint64_t *lowaddr, uint64_t *highaddr,

                              int elf_machine, int clear_lsb)

{

    struct elfhdr ehdr;

    struct elf_phdr *phdr = NULL, *ph;

    int size, i, total_size;

    elf_word mem_size;

    uint64_t addr, low = (uint64_t)-1, high = 0;

    uint8_t *data = NULL;

    char label[128];

    if (read(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))

        goto fail;

    if (must_swab) {

        glue(bswap_ehdr, SZ)(&ehdr);

    }

    switch (elf_machine) {

        case EM_PPC64:

            if (EM_PPC64 != ehdr.e_machine)

                if (EM_PPC != ehdr.e_machine)

                    goto fail;

            break;

        case EM_X86_64:

            if (EM_X86_64 != ehdr.e_machine)

                if (EM_386 != ehdr.e_machine)

                    goto fail;

            break;

        default:

            if (elf_machine != ehdr.e_machine)

                goto fail;

    }

    if (pentry)

           *pentry = (uint64_t)(elf_sword)ehdr.e_entry;

    glue(load_symbols, SZ)(&ehdr, fd, must_swab, clear_lsb);

    size = ehdr.e_phnum * sizeof(phdr[0]);

    lseek(fd, ehdr.e_phoff, SEEK_SET);

    phdr = qemu_mallocz(size);

    if (!phdr)

        goto fail;

    if (read(fd, phdr, size) != size)

        goto fail;

    if (must_swab) {

        for(i = 0; i < ehdr.e_phnum; i++) {

            ph = &phdr[i];

            glue(bswap_phdr, SZ)(ph);

        }

    }

    total_size = 0;

    for(i = 0; i < ehdr.e_phnum; i++) {

        ph = &phdr[i];

        if (ph->p_type == PT_LOAD) {

            mem_size = ph->p_memsz;

            /* XXX: avoid allocating */

            data = qemu_mallocz(mem_size);

            if (ph->p_filesz > 0) {

                if (lseek(fd, ph->p_offset, SEEK_SET) < 0)

                    goto fail;

                if (read(fd, data, ph->p_filesz) != ph->p_filesz)

                    goto fail;

            }

            /* address_offset is hack for kernel images that are

               linked at the wrong physical address.  */

            if (translate_fn) {

                addr = translate_fn(translate_opaque, ph->p_paddr);

            } else {

                addr = ph->p_paddr;

            }

            snprintf(label, sizeof(label), "phdr #%d: %s", i, name);

            rom_add_blob_fixed(label, data, mem_size, addr);

            total_size += mem_size;

            if (addr < low)

                low = addr;

            if ((addr + mem_size) > high)

                high = addr + mem_size;

            qemu_free(data);

            data = NULL;

        }

    }

    qemu_free(phdr);

    if (lowaddr)

        *lowaddr = (uint64_t)(elf_sword)low;

    if (highaddr)

        *highaddr = (uint64_t)(elf_sword)high;

    return total_size;

 fail:

    qemu_free(data);

    qemu_free(phdr);

    return -1;

}